空时耦合项对空时自适应处理的影响

Influence of the space-time coupling term on STAP

为了利用混响谱的扩展和空-时耦合特性,采用空时自适应处理(STAP)理论进行混响抑制和运动目标检测,提出了应用于水下声呐环境的空时自适应修正方法.结合雷达目标回波模型分析了空时自适应的原理;分析混响空-时耦合项,对空时自适应方法进行修正,并提出了应用空-时耦合导向矢量进行空时处理;将该修正方法用于最优处理和目标检测.仿真结果表明,修正空时自适应方法有利于水下目标检测,应用空-时耦合导向矢量有助于提高目标方位估计能力.

In order to use the power spectrum propagation characteristics and adopt the theory of STAP for reverberation suppression and moving object detection,an improved method of STAP for sonar is proposed.Firstly,the principle of STAP is analyzed according to the echo model of radar.Secondly,comparing the echo models of sonar and radar,this method of STAP is presented and the Space-time coupling steering vector is used in space time processing.Finally,the proposed method of STAP is applied in space time processing and object detection.Simulation results illustrate that the modified method of STAP is beneficial to underwater object detection,and that applying the space-time coupling steering vector can increase the accuracy of the direction estimation of targets.